CN104617703B - Vibration motor - Google Patents

Abstract

The invention discloses a vibrating motor, which includes a casing, an output shaft is rotated in the casing, two oppositely placed coils are arranged on the side wall of the casing, and a gear switch for controlling the frequency of an AC power supply is also included. The output shaft is fixedly provided with an armature component that responds to the coil, and also includes an elastic insert, a slot is provided at the bottom of the output shaft, and a slot for insertion of the elastic insert is provided at the bottom end of the slot. One end of the elastic insert is provided with a driving mechanism for pushing the elastic insert. Compared with the prior art, the present invention provides a slot for the insertion of the elastic insert at the bottom of the output shaft and a drive mechanism for pushing the reed. When the gear switch switches between gears with different vibration frequencies, the drive mechanism The reed is inserted into the slot of the output shaft to change its elastic deformation coefficient, so that when the nursing appliance switches between different frequency gears, the output frequency of the coil can be guaranteed to be consistent with the frequency of the output shaft of the vibration motor.

Description

vibration motor

technical field

The invention belongs to the field of motors, and more specifically relates to a vibration motor.

Background technique

Vibration motors are motors commonly used in personal care appliances, such as electric toothbrushes, electric face washers, etc., all have vibration motors inside, and the output shaft of the vibration motor is connected to the brush head to transfer the vibration of the output shaft of the vibration motor to the brush head. site transfer. The vibration motor of the existing vibration motor includes a housing, in which there are two oppositely placed coils, an AC power supply is passed through the coils, and a gear switch for controlling the frequency of the AC power supply is also included. The output shaft is rotatably arranged inside the housing, and armatures are arranged at both ends of the output shaft, and the armature responds to the change of the magnetic field in the coil so that the output shaft moves along the shaft center. Angle of rotation.

The above-mentioned structure has the following problems: because before designing the nursing appliance, the natural frequency of the output shaft needs to be designed according to the output frequency of the vibration motor coil, so that the output frequency of the coil and the natural frequency of the output shaft can be consistent (even if the two produce Resonance), for nursing appliances whose gears cannot be adjusted, since the output frequency of the coil is always kept constant, it is convenient to design the natural frequency of the output shaft according to its output frequency. However, most of the current personal care appliances have an adjustable vibration level, that is, the vibration frequency of the output part is controlled by adjusting the output frequency of the coil. At this time, a contradiction arises: that is, because the natural frequency of the output shaft of the existing personal care appliance vibration motor is fixed at the time of design (determined by the hardness and quality of the output shaft material), the output of the coil The frequency is adjusted at any time according to the user's needs. When switching between different gears, it is difficult to make the output frequency of the coil consistent with the natural frequency of the output shaft. At this time, the vibration will not be fully transmitted to the required parts.

Contents of the invention

Aiming at the deficiencies in the prior art, the present invention provides a vibration motor. When the gear switch switches between gears with different vibration frequencies, the elastic insert is inserted into the groove of the output shaft through the driving mechanism to change its elastic deformation coefficient. , so that when the massage instrument switches between different gears, the output frequency of the coil can be guaranteed to be consistent with the frequency of the output shaft of the vibration motor.

The present invention is achieved through the following technical solutions: the vibration motor includes a housing, an output shaft is rotated in the housing, and two oppositely placed coils are arranged on the side wall of the housing, and the coils are connected through It also includes a gear switch for controlling the frequency of the AC power supply, an armature component that responds to the coil is fixedly arranged on the output shaft, and an elastic insert is also included at the bottom of the output shaft. A slot is provided, and a slot for inserting the elastic insert is provided at the bottom end of the slot, and a drive mechanism for pushing the elastic insert is provided at one end of the elastic insert, and the drive mechanism and the gear switch The drive mechanism is electrically connected and fixed on the housing, and when the gear switch changes the output frequency of the AC power supply, the drive mechanism controls the insertion of the elastic insert into or out of the slot.

In the above technical solution, the housing includes an upper end cover and a lower end cover, and bearings for supporting the output shaft are arranged in the upper end cover and the lower end cover.

In the above technical solution, a trigger switch is provided inside the housing outside the swing angle of the output shaft. When the swing angle of the output shaft is abnormal, the armature on the output shaft contacts the trigger switch.

The present invention has the following beneficial effects: by setting the groove for the insertion of the elastic insert at the bottom of the output shaft and the driving mechanism (generally a small air cylinder or hydraulic cylinder) for pushing the reed, the gear switch can be operated between the gears of different vibration frequencies. When switching, the reed is inserted into the groove of the output shaft through the driving mechanism to change its elastic deformation coefficient, so that when the care appliance switches between different frequency gears, the output frequency of the coil can be guaranteed to be consistent with the frequency of the output shaft of the vibration motor Therefore, it is ensured that the vibration of the output shaft can be fully transmitted to the brush head part of the personal care appliance in each gear position.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

FIG. 2 is a schematic cross-sectional view along line A-A in FIG. 1 .

Figure 3 is the slot provided at the bottom of the output shaft.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments: Referring to Fig. The body 1 is provided with an output shaft 2 for rotation, and a bearing 8 for supporting the output shaft 2 is provided in the upper end cover 10 and the lower end cover 11, and two oppositely placed coils are provided on the side wall of the housing 1 4. An AC power supply is passed through the coil 4 so that an alternating magnetic field is formed between the coils, and a gear switch 5 for controlling the frequency of the AC power supply is also included, and a response is fixed on the output shaft 2. The armature part 3 of the coil 4 . There is a gap between the armature component 3 and the coil 4, so that the output shaft 2 can swing back and forth at a specific angle within the range of the gap, and the above-mentioned angle is preferably between 3 degrees and 5 degrees.

It also includes an elastic insert 6, a slot 20 is provided at the bottom of the output shaft 2, and a slot 21 for inserting the elastic insert 6 is provided at the bottom of the slot 20, see FIG. 3, the slot 21 There are three, correspondingly provided with three elastic inserts 6 that cooperate with the slots 21, and one end of the elastic inserts 6 is provided with a drive mechanism 7 that pushes the elastic inserts 6 (the drive mechanism can be a small cylinder or hydraulic cylinder, etc.), the drive mechanism 7 is electrically connected to the gear switch 5 and the drive mechanism 7 is fixed on the housing 1, when the gear switch 5 changes the output frequency of the AC power supply, the The driving mechanism 7 controls the insertion or removal of the elastic insert 6 from the slot 21 . When the gear switch 5 changes the output frequency of the AC power supply, the drive mechanism 7 controls the elastic insert 6 to insert or disengage from the slot 21 . Specifically, the natural frequency of the output shaft 2 can be set to be consistent with the output frequency of the smaller gear of the coil. The frequency remains consistent, and at this time the elastic insert is not inserted into the slot at the bottom of the output shaft 2. In this small gear, the output frequency of the coil can be guaranteed to be consistent with the frequency of the output shaft of the vibration motor, thereby achieving resonance. The vibration of the vibrating motor is fully transmitted to the brush head of the nursing appliance; when the gear switch 5 is used to modulate the output frequency of the coil to a larger gear, the drive mechanism 7 receives the signal changed by the gear switch 5, thereby driving The elastic insert 6 moves toward the direction of the slot 21 and enters the slot 21 provided at the bottom of the output shaft 2, so that when the output shaft 2 rotates at a specific angle, it is elastically supported by the elastic insert, which is equivalent to increasing the output by the elastic insert. The natural frequency of the output shaft is ensured. The above setting ensures that when the coil switches the output frequency of different gears, the corresponding number of reeds are arranged in the slot 21 opened on the output shaft 2 to ensure that the coil is in different gears. The output frequency is always consistent with the natural frequency of the output shaft.

A trigger switch 9 is arranged outside the swing angle of the output shaft 2 in the housing 1. The trigger switch 9 is connected to the inner wall of the housing through a supporting piece 9a. The supporting piece 9a is elastic, and when the output shaft 2 swings at When abnormal, the armature component 3 on the output shaft 2 is in contact with the trigger switch 9, so that the trigger switch 9 detects the above abnormal state. The abnormal swing angle is above 9 degrees. That is, when the vibrating motor of the personal care appliance swings at an abnormal angle, the trigger switch 9 can detect the above-mentioned abnormality, thereby reminding the user in time to maintain and maintain the care appliance (it can be detected by connecting the trigger switch 9 to an alarm unit or a signal, etc. realize the reminder function).

The above examples are only specific examples of the present invention, and obviously, the present invention is not limited to the above examples. All deformations that can be directly derived or associated by those skilled in the art from the content disclosed in the present invention shall belong to the protection scope of the present invention.

Claims (3)

1. vibrating motor, including housing (1), rotates in described housing (1) and is provided with output shaft (2), in described housing (1) side Wall is provided with two coils staggered relatively (4), is passed through alternating current power supply in described coil (4), also includes described for controlling The driving switch (5) of ac power frequency, is fixedly installed the armature portion responding described coil (4) on described output shaft (2) Part (3), described armature component (3) responds described coil (4) so that output shaft (2) carries out the reciprocally swinging of special angle, It is characterized in that: also include an elastic inserted sheet (6), described output shaft (2) bottom is provided with groove (20), in this groove (20) bottom It is provided with the slot (21) inserting for described elasticity inserted sheet (6), described elasticity inserted sheet (6) one end is provided with the described elasticity of promotion and inserts The drive mechanism (7) of piece (6), described drive mechanism (7) is electrically connected with described driving switch (5) and this drive mechanism (7) is solid It is connected on described housing (1), when driving switch (5) changes described alternating current power supply output frequency, described drive mechanism (7) controls Described elasticity inserted sheet (6) insertion or the described slot of disengaging (21).

2. vibrating motor as claimed in claim 1 it is characterised in that: described housing (1) includes upper end cover (10) and bottom end cover (11) in described upper end cover (10) and bottom end cover (11), it is provided with the bearing (8) for supporting described output shaft (2).

3. vibrating motor as claimed in claim 1 it is characterised in that: in described housing (1) be located at output shaft (2) angle of oscillation It is outside one's consideration and be provided with trigger switch (9), when output shaft (2) pendulum angle is abnormal, the armature component (3) on described output shaft (2) Contact with this trigger switch (9), described anomalous swing angle is more than 9 degree.